工作分析方法中，其缺点为有些问题调查不够深入，不利于掌握某些专门信息的方法是（） A

Dear mom,

I’m writing to you from America. You don’t know how happy I am. I made many new friends here. They are very helpful. Last week I got a fever and had to stay in bed for three days. They helped me a lot with my lessons. Cathy is one of my good friends at school. She has a round face with a pair of glasses. She is two months older than I am, but a little shorter . She works hard and is good at all her lessons. She often helps me with my English. We like talking to each other at lunchtime. After school, we always go home together because we live in the same street.

Sometimes we take a dancing lesson for half an hour before we go home. She dances better than any other student. She wants to be a dancer when she grows up. At the weekends, Cathy usually goes swimming. I sometimes go swimming with her. I think it’s a good way to keep healthy. We always have a good time.

Write soon.

Love

Lanlan

小题1:Who wrote the letter?

A. Lanlan’s mom                   B. Lanlan          C. Cathy

小题2: Where is Lanlan now?

A. In America.                      B. In China.           C. At school.

小题3: Does Cathy wear glasses?

A. We don’t know.                 B. No, she doesn’t.        C. Yes, she does.

小题4:What does Cathy want to be when she grows up?

A. A dancer.                       B. A singer.       C. A teacher.

小题5: Cathy is Lanlan’s ______.

A. teacher                     B. student         C. friend

计算机指令系统中有多种寻址方式，这样做主要目的是 (208) 。在下列寻址方式中取得操作数速度最慢的是 (209) 。

A．简化指令的设计
B．可直接访问内存或外存
C．提供扩展操作码并降低指令译码难度
D．缩短指令长度，扩大寻址空间，提高编程灵活性

人类体细胞具有多少对染色体（）

A.1

B.22

C.23

D.46

E.48

的值是（）

A．0.000001

B．0.1

C．1000

D．1000000

1025t/h水冷壁及环形联箱是怎样的？